第四速及第五速变速叉钻19孔夹具设计【三维SW模型】

摘要

本设计是基于汽车拨叉零件的加工工艺规程及一些工序的专用夹具设计。汽车拨叉零件的主要加工表面是平面及孔系。一般来说，保证平面的加工精度要比保证孔系的加工精度容易。因此，本设计遵循先面后孔的原则。并将孔与平面的加工明确划分成粗加工和精加工阶段以保证孔系加工精度。主要加工工序安排是先以支承孔系定位加工出顶平面，再以顶平面与支承孔系定位加工出工艺孔。在后续工序中除个别工序外均用顶平面和工艺孔定位加工其他孔系与平面。支承孔系的加工采用的是坐标法镗孔。整个加工过程均选用专用夹具，夹紧方式多选用手动夹紧，夹紧可靠，机构可以适当设计成自锁，因此生产效率较高，适用于大批量、流水线上加工，能够满足设计要求。

关键词：汽车拨叉零件；工艺；夹具；

ABSTRACT
This design is the special fixture for machining technology for the chemical pipeline parts and process design based on. The main processing surface chemical pipeline parts is the plane and a series of hole. In general, ensure the machining accuracy of plane than to ensure the accuracy of the processing easily. Therefore, the design follows the surface after the first hole principle. And the hole and the plane processing clearly divided into roughing and finishing stages to ensure machining precision. The main process of machining technology is first to support hole positioning processing the top plane, and then the top plane and the series of supporting hole location hole processing technology. In addition to the follow-up processes are individual processes with the top plane positioning technology and other processing Kong and plane. Processing support holes using the coordinate boring. The whole process selection of general. The special fixture fixture, clamping means more choice of pneumatic clamping, clamping reliable, agencies can not self-locking, therefore the production efficiency is high, suitable for large batch, line processing, can meet the design requirements.
Keywords: chemical pipe parts; technology; fixture;

目录
摘要I
ABSTRACT II
目录0
第一章机械加工工艺规程设计2
1.1零件的分析2
1.1.1零件的作用2
1.1.2零件的工艺分析2
1.1.3孔和平面的加工顺序3
1.2孔系加工方案选择3
1.3汽车拨叉加工定位基准的选择4
1.3.1粗基准的选择4
1.3.2精基准的选择4
1.4汽车拨叉加工主要工序安排4
第二章余量及毛胚尺寸确定8
2.1机械加工余量、工序尺寸及毛坯尺寸的确定8
2.2毛坯种类的选择8
2.3选择加工设备和工艺装备9
2.3.1机床选用9
2.3.2选择刀具9
2.3.3选择量具9
2.4机械加工余量、工序尺寸及毛坯尺寸的确定10
第三章切削用量计算12
3.1工序1 12
3.2工序2 12
3.3工序3：铣圆柱Φ34一侧端面12
3.4工序4：铣圆柱Φ34另外一侧端面13
3.5工序5：铣叉口端面一侧端面14
3.6工序6：铣叉口端面另外一侧端面16
3.7工序7：钻、扩、孔16
3.8工序8：粗镗、精镗Φ82孔19
3.9工序9：铣尺寸10MM两端面20
3.10工序10：铣削凸台上16的槽口面21
3.11工序11：铣削凸台M10X1端面23
3.12工序12：钻M10X1底孔及攻M10X1螺纹孔24
第四章专用夹具设计25
4.1研究原始质料25
4.2定位基准的选择25
4.3夹具的导向25
4.4钻孔与工件之间的切屑间隙26
4.5切削力及夹紧力的计算26
4.6定位误差的分析27
4.7钻套、衬套、钻模板设计与选用28
4.8确定夹具体结构和总体结构29
4.9夹具设计及操作的简要说明30
总结32
参考文献33
致谢34

A1-夹具体

A1-总装图

A3-工序用图

A3-毛坯图

A3-汽车拨叉零件图

A4-钻套